Chapter 2 Flashcards

1
Q

The study of microscopic plants and animals

A

Microbiology

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2
Q

The study of drugs

A

Pharmacology

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3
Q

Is the smallest unit of ELEMENTS

A

Atom

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4
Q

Substances from which all matter is made

A

Elements

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5
Q

What are the 96% pf the human body is made up of 4 elements

A

Oxygen (65%)
Carbon (18.5%)
Hydrogen (9.5%)
Nitrogen (3%)

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6
Q

Atom’s centre , core of atom

Composed of protons and neutrons

A

Nucleus

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7
Q

Negatively charged particles

Orbit in energy levels around the nucleus

A

Electrons

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8
Q

Is the equal number of protons in an atom’s nucleus

A

Atomic number

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9
Q

The equal to the number of protons and neutrons combined

A

Atomic mass

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10
Q

Elements that have a stable number of electrons in the outer level

A

Nonreactive elements

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11
Q

The number of bonds an atom needs to fill its outermost energy level and become stable

A

Valence (strength)

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12
Q

Form when one atom transfers electrons to another form

Weak

Mixed with water

A

Ionic bonds

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13
Q

Atoms or group of atoms with a positive or negative charge

A

Ions

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14
Q

Atoms that donates an electron

A

Cation

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15
Q

Atom that accepts an electron

A

Anion

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16
Q

Compounds that separate into ions when put in the solution

A

Electrolytes

17
Q

Form when two atoms share electrons to complete the energy level and thus become stable

Very strong

Most common chemical bond

Doesnt mix well with water

A

Covalent bond

18
Q

Electrons are shared equally

A

Nonpolar covalent

19
Q

Electrons are shared unequally

A

Polar covalent

20
Q

Chemicals composed of two or more atoms held together with covalent bonds only

A

Molecule

21
Q

Chemicals composed of two or more different atoms held together by ionic or covalent bonds

A

Compounds

22
Q

A blend of 2 or more substances that retain there individual identities

A

Mixtures

23
Q

Generally solids that dissolve in a liquid

A

Solutions

24
Q

Body fluid ph less than 7.35 called

A

Acidosis

25
Q

Body fluid ph greater than 7.45 called

A

Alkalosis

26
Q

Chemicals that prevent sharp changes in H concentration

Important in maintaning relatively constant ph in body fluids

A

Buffers

27
Q

Forms of an element that have the same atomic number but different atomic weight

A

Isotopes

28
Q

Emission of atomic particles from an isotope

A

Radioactivity

29
Q

Unstable
Radiate subatomic particles

A

Radioactive isotopes

30
Q

Are proteins that accelerate chemical reactions

Essential in metabolism

A

Enzymes